Is your feature request related to a problem? Please describe.

Users reported that they currently cannot enter multi-line expressions into connector template fields such as REST connector -> URL that validate against a static URL pattern, too:

I believe we want to improve the regular expressions to allow all patterns that are expressions, i.e. start with =.

Describe the solution you'd like

• Improve our regular expressions to allow multi-line expressions, starting with =. Example provided here.

Describe alternatives you've considered

There is a number of additional thoughts sketched in the original issue (camunda/camunda-modeler#4001). All of these would remove flexibility from you, element template (connector) authors.

Additional context

Brought up in camunda/camunda-modeler#4001, originally from this discussion.

What we decided at the core is to make this a user land concern (you have all tools available), hence I'm opening this issue.